release/src/router/openssl/crypto/bio/bf_nbio.c

   1 /* crypto/bio/bf_nbio.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <errno.h>
  61 #include "cryptlib.h"
  62 #include <openssl/rand.h>
  63 #include <openssl/bio.h>
  64
  65 /*
  66  * BIO_put and BIO_get both add to the digest, BIO_gets returns the digest
  67  */
  68
  69 static int nbiof_write(BIO *h, const char *buf, int num);
  70 static int nbiof_read(BIO *h, char *buf, int size);
  71 static int nbiof_puts(BIO *h, const char *str);
  72 static int nbiof_gets(BIO *h, char *str, int size);
  73 static long nbiof_ctrl(BIO *h, int cmd, long arg1, void *arg2);
  74 static int nbiof_new(BIO *h);
  75 static int nbiof_free(BIO *data);
  76 static long nbiof_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
  77 typedef struct nbio_test_st {
  78     /* only set if we sent a 'should retry' error */
  79     int lrn;
  80     int lwn;
  81 } NBIO_TEST;
  82
  83 static BIO_METHOD methods_nbiof = {
  84     BIO_TYPE_NBIO_TEST,
  85     "non-blocking IO test filter",
  86     nbiof_write,
  87     nbiof_read,
  88     nbiof_puts,
  89     nbiof_gets,
  90     nbiof_ctrl,
  91     nbiof_new,
  92     nbiof_free,
  93     nbiof_callback_ctrl,
  94 };
  95
  96 BIO_METHOD *BIO_f_nbio_test(void)
  97 {
  98     return (&methods_nbiof);
  99 }
 100
 101 static int nbiof_new(BIO *bi)
 102 {
 103     NBIO_TEST *nt;
 104
 105     if (!(nt = (NBIO_TEST *)OPENSSL_malloc(sizeof(NBIO_TEST))))
 106         return (0);
 107     nt->lrn = -1;
 108     nt->lwn = -1;
 109     bi->ptr = (char *)nt;
 110     bi->init = 1;
 111     bi->flags = 0;
 112     return (1);
 113 }
 114
 115 static int nbiof_free(BIO *a)
 116 {
 117     if (a == NULL)
 118         return (0);
 119     if (a->ptr != NULL)
 120         OPENSSL_free(a->ptr);
 121     a->ptr = NULL;
 122     a->init = 0;
 123     a->flags = 0;
 124     return (1);
 125 }
 126
 127 static int nbiof_read(BIO *b, char *out, int outl)
 128 {
 129     int ret = 0;
 130 #if 1
 131     int num;
 132     unsigned char n;
 133 #endif
 134
 135     if (out == NULL)
 136         return (0);
 137     if (b->next_bio == NULL)
 138         return (0);
 139
 140     BIO_clear_retry_flags(b);
 141 #if 1
 142     if (RAND_pseudo_bytes(&n, 1) < 0)
 143         return -1;
 144     num = (n & 0x07);
 145
 146     if (outl > num)
 147         outl = num;
 148
 149     if (num == 0) {
 150         ret = -1;
 151         BIO_set_retry_read(b);
 152     } else
 153 #endif
 154     {
 155         ret = BIO_read(b->next_bio, out, outl);
 156         if (ret < 0)
 157             BIO_copy_next_retry(b);
 158     }
 159     return (ret);
 160 }
 161
 162 static int nbiof_write(BIO *b, const char *in, int inl)
 163 {
 164     NBIO_TEST *nt;
 165     int ret = 0;
 166     int num;
 167     unsigned char n;
 168
 169     if ((in == NULL) || (inl <= 0))
 170         return (0);
 171     if (b->next_bio == NULL)
 172         return (0);
 173     nt = (NBIO_TEST *)b->ptr;
 174
 175     BIO_clear_retry_flags(b);
 176
 177 #if 1
 178     if (nt->lwn > 0) {
 179         num = nt->lwn;
 180         nt->lwn = 0;
 181     } else {
 182         if (RAND_pseudo_bytes(&n, 1) < 0)
 183             return -1;
 184         num = (n & 7);
 185     }
 186
 187     if (inl > num)
 188         inl = num;
 189
 190     if (num == 0) {
 191         ret = -1;
 192         BIO_set_retry_write(b);
 193     } else
 194 #endif
 195     {
 196         ret = BIO_write(b->next_bio, in, inl);
 197         if (ret < 0) {
 198             BIO_copy_next_retry(b);
 199             nt->lwn = inl;
 200         }
 201     }
 202     return (ret);
 203 }
 204
 205 static long nbiof_ctrl(BIO *b, int cmd, long num, void *ptr)
 206 {
 207     long ret;
 208
 209     if (b->next_bio == NULL)
 210         return (0);
 211     switch (cmd) {
 212     case BIO_C_DO_STATE_MACHINE:
 213         BIO_clear_retry_flags(b);
 214         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 215         BIO_copy_next_retry(b);
 216         break;
 217     case BIO_CTRL_DUP:
 218         ret = 0L;
 219         break;
 220     default:
 221         ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
 222         break;
 223     }
 224     return (ret);
 225 }
 226
 227 static long nbiof_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 228 {
 229     long ret = 1;
 230
 231     if (b->next_bio == NULL)
 232         return (0);
 233     switch (cmd) {
 234     default:
 235         ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
 236         break;
 237     }
 238     return (ret);
 239 }
 240
 241 static int nbiof_gets(BIO *bp, char *buf, int size)
 242 {
 243     if (bp->next_bio == NULL)
 244         return (0);
 245     return (BIO_gets(bp->next_bio, buf, size));
 246 }
 247
 248 static int nbiof_puts(BIO *bp, const char *str)
 249 {
 250     if (bp->next_bio == NULL)
 251         return (0);
 252     return (BIO_puts(bp->next_bio, str));
 253 }